4 years & up. Use the Magtronix Starter Set to build your own working electronic circuits by piecing together the magnetic circuit blocks in different combinations. Take on the challenge of building the circuit ideas featured in the activity guide. Children can learn how a circuit works along with developing cognitive and problem-solving skills through hands-on, STEM-based play. Requires 3 AA (not included). Included: Switch, Battery Pack, Buzzer, LED, Motor, 5 Direction Pieces, Helicopter, and an Activity Guide.